Dictionary » P » Permeability




(1) The property or state of being permeable (as by osmosis or diffusion).

(2) The property of a porous material to permit a liquid or gas to pass through.

(3) (geology) The ability of a rock, soil or sediment to transmit water.

(4) (physics) Magnetic permeability.


Word origin: LL permeābilis, equiv. to permeā(re) to permeate.
Related forms: permeable (adjective).

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Re: Urea and membrane permeability of RBC

I realize I am a few years late, but I see a lot of misinformation on this topic on the web, so I think it is important. Red blood cells have a lot of urea transporters and a lot of aquaporins (water channels). That is how urea and water get into the red blood cell. It is not the urea itself going i...

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by kidprof
Thu Aug 08, 2013 8:18 pm
Forum: Cell Biology
Topic: Urea and membrane permeability of RBC
Replies: 2
Views: 35904

what is the relationship between hemolysis & molecular weigh

is it true that as the lipid water partition coefficient increases, the permeability of lipid increases and the permeability of water lowers. does that mean that a substance w/ a high lipid water partition coeffecient will be able to go through the cell membrane ...

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by Fa23
Sat Sep 22, 2012 11:35 pm
Forum: Physiology
Topic: what is the relationship between hemolysis & molecular weigh
Replies: 1
Views: 3660

Oxygen Only Metabolism

how does metabolic activity affect k permeability?

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by ozil
Sun Feb 12, 2012 6:35 pm
Forum: General Discussion
Topic: Oxygen Only Metabolism
Replies: 3
Views: 1240

Re: speed of osmosis?

... smaller molecules diffuse faster than larger molecules. Think about the relationship of diffusion and osmosis. In addition to diffusion, membrane permeability is a factor -- that's Jack's cats and elephants metaphor. The combination of diffusion rate and membrane permeability determines the rate ...

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by jonmoulton
Thu Feb 09, 2012 4:07 pm
Forum: General Discussion
Topic: speed of osmosis?
Replies: 8
Views: 4692


... the cell. but tonoplast usually doesn't allow to the water to enter to the cytoplasm. (vacuole's tonoplast has an attribute named "selective permeability" cause it) I hope you had got what I mean.

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by Maatomaat
Thu Nov 24, 2011 10:40 am
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 7017
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